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Exam 6: Advanced Encryption Standard

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Question 1

Multiple Choice

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Division requires that each nonzero element have a(n) __________ inverse.

A) multiplicative
B) divisional
C) subtraction
D) addition

E) None of the above
F) C) and D)

Correct Answer

verified

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Question 2

Multiple Choice

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the cipher consists of N rounds, where the number of rounds depends on the __________ .

A) key length
B) output matrix
C) State
D) number of columns

E) All of the above
F) B) and D)

Correct Answer

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A

Question 3

Short Answer

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the forward substitute byte transformation, called _________ , is a simple table lookup.

the first row of State is not altered; for the second row a 1-byte circular left shift is performed; for the third row a 2-byte circular left shift is performed; and For the fourth row a 3-byte circular left shift is performe D.this transformation Is called __________ .

the Rijndael developers designed the expansion key algorithm to be resistant to known cryptanalytic attacks.

An example of a finite field is the set Zp consisting of all the integers {0, 1, ..., p - 1}, where p is a __________ and in which arithmetic is carried out modulo p.

the _________ transformation operates on each column individually.Each byte of a column is mapped into a new value that is a function of all four bytes in that column.

AES processes the entire data block as a single matrix during each round using __________ and permutation.

In Advanced Encryption Standard all operations are performed on __________ bytes.

___________ affects the sequence of bytes in State but does not alter byte contents and does not depend on byte contents to perform its transformation.

the encryption round has the structure:

the __________ is when a small change in plaintext or key produces a large change in the ciphertext.

the four separate functions of the Advanced Encryption Standard are: permutation, arithmetic operations over a finite field, XOR with a key, and __________ .

At each horizontal point, State is the same for both encryption and decryption.

In AES, the arithmetic operations of addition, multiplication and division are performed over the finite field _________ .

the transformations AddRoundKey and InvMixColumn alter the sequence of bytes in State.

the nonlinearity of the S-box is due to the use of the multiplicative inverse.

the __________ is a block cipher intended to replace DES for commercial applications.It uses a 128-bit block size and a key size of 128, 192, or 256 bits.

the cipher consists of N rounds, where the number of rounds depends on the __________ .

In the AddRoundKey transformation the 128 bits of State are bitwise XORed with the _________ of the round key.